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Old May 14th, 2020, 08:51 AM   #3
jacobobb
ninjette.org newbie
 
Name: j
Location: Cincinnati
Join Date: May 2020

Motorcycle(s): 2011 Ninja 250

Posts: 2
Quote:
Originally Posted by jkv45 View Post
It's the battery.

A new battery can fail without warning, just like an old one.

A volt meter will tell you for sure. Anything less than 12.7 V before starting is a discharged battery.
How would that happen while it's running? While it's on, the VRR should be charging the battery (assuming the stator is supplying AC power) and running the engine, so it shouldn't be drawing on the battery at all. If I had turned it off and it wouldn't crank, then sure it could definitely be the battery. It died while I had the throttle open 75% and I was moving, an hour into the ride.

I'm going to hook up a multimeter this weekend to try to pinpoint the issue, but I've never heard of a brand new AGM battery dying in less than a year.

Edit: You were partially right. The rain finally stopped, so I took the seat off to check the damage. The positive lead vibrated loose on the battery. Tightened the screw, and works good as new.

Would a lock washer on the screw keep that from happening?
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